Pulse or digital communications – Repeaters – Testing
Patent
1998-06-09
1999-10-26
Ghebretinsae, Temesghen
Pulse or digital communications
Repeaters
Testing
375208, H04B 169
Patent
active
059740809
ABSTRACT:
A method for a receiving station acquiring a spread spectrum signal, wherein the spread spectrum signal has its frequency spectrum spread by being modulated with a first pseudonoise (PN) code generated serially and cyclically by a transmitting station at a first rate. The method of acquiring comprises the process of determining that the offset of a second PN code, identical to the first PN code but generated by the receiving station at substantially the same rate as the first rate and having its offset controlled by the receiving station, is synchronized with the offset of the PN code of the received spread spectrum signal. In the method a demodulation of a received spread spectrum signal is performed by the receiving station to obtain a demodulated signal. Then, the demodulated signal is tested in a first, test stage by performing one or more basic tests involving comparing the demodulated signal with the second PN code at a predetermined offset. For demodulated signals for which the test stage result is positive the demodulated signal is tested in a second, verification stage by maintaining the second PN code at the predetermined offset, and testing the demodulated signal in a sequence of hierarchically related substages, each having a substage specific criterion. When the demodulated signal fails the test stage or the verification stage, the predetermined offset for the second PN code is changed according to a predetermined sequence, and the step of testing the demodulated signal in the test stage is performed again iteratively until the highest hierarchical level substage specific criterion is achieved, upon the occurrence of which the received spread spectrum signal is acquired.
REFERENCES:
patent: 4630283 (1986-12-01), Schiff
patent: 5003552 (1991-03-01), Mower
Brady III Wade James
Donaldson Richard L.
Ghebretinsae Temesghen
Moore J. Dennis
Texas Instruments Incorporated
LandOfFree
Hierarchical-serial acquisition method for CDMA systems using pi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hierarchical-serial acquisition method for CDMA systems using pi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hierarchical-serial acquisition method for CDMA systems using pi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-772287